Stenciling machine



@%. 6, 19310 j A MUELLER. 1,826,149

STENCILING MACHINE Filed Nov. 2, 1929 3 Sheets-Sheet, l

@ck G, 1931.; .s. A. MUELLER STENCILING MACHINE Filed Nov. 2, 1929 3 Sheets-Sheet, 2

Oct. 6, 1933, J MUELLER 3,82%,149

STENCILING MACHINE Filed Nov. 2, 1929 3 Sheets-Sheet, 3

Patented Oct. 6, '1931 UNITED STATES )RATENT OFFICE JOHANN ARTHUR MUELLER, OF BERLIN, GERMANY s'rnncrmlve MACHINE Application filed November 2, 1929,"Seria1 No. 404,446, and in. Germany July 18, 1929.

The invention relates to a demountable printing-drum with removable crank-pin for stenciling-machines, which: 1

1. Inks automatically without any mechanical arrangement or hindrance and without special trough or such like.

2. Takes the whole stock of ink inside the drum.

3. Diminishes the flow of ink towards the lower part of the printing-surface. I

4. Provides a filling of ink without any loss and without soiling the hands.

5. Guides an automatic switch-weight feeder rolling on ballbearings'on horizontal rails with:

a) Different printing-heights and I A b) Different lengths of the movement of the paper-feeder.

Fig. 1 shows eral view; Figs. 2, 2a the machine with demount'ed drum; Fig. 3 the drum with segment connected with a slitted swing-lever by means of an actuating arm moving the axle, on which the paper-feeder ismttached, with regulation of the printing-height'and length of the movement of the feeder; Fig. 3a., a front view showing the sheet feeding device; Fig. 4 the regulation of the pressure of the pressure-roller situated underthe printingdrum; Fig. 4a shows the pressure roller throw-0E; Figs. 5, 5w, 6,7, 7a, the printingfor the printing-pad and stencil; Fig, 8 filldrum with sieve and difi'erent arrangements ing of ink through the side-plate of the drum by means of a tube; Figs. 9, 9a, 10, 10a the automatic paper-feeder; Fig. 11 the automatic paper-feeder with automatic switch acting as soon as the last sheet of paper is 6 consumed. Fig. 12 and Fig. 12a another arrangement for removing and fixing the crank pin, instead of a segment; Figs. 13 and 13a show the clamping means for one of the paper guides- The printing-drum is a closed cylinder 1 Fig. 5 with filling-hole for ink 2 in the side plate 3 of the drum 1 Figs. 5a, 8.

The circumference of the cylinder 1 is larger, than the. surface of the paper,'which has to be printed, Figs. 2, 5, 6, 7. The circumference of the cylinder 1 is partly prothe stencil-machine in a genvided with holes like a sieve, namely from 4 to 5, through which the ink passes from the inside of the drum 1 into the printin pad 6 I Fig. 5. On top of this printing-pa Is the stencil with writing,,from which the prints are made.

In consideration of the fact that the ink,

contained intlie pad, is squeezed by the presment of the perforations can be seen on the demounted drum 1 of Fig. 2. v

. Fig. 5 shows that a large part of the cylin-- der 1 from 4 to 5 downwards is not perforated being downwards as soon as the machine is out of use; this part takes the Whole stock of ink and nothing can pass outside, when the machine is out of use.

When turning the drum 1, the ink flows along theinside of the druml and ink is absorbed by the pad 6 Fig. 5 as much as consumed.

- Having placed the holding means for the stencil and pad 8, 9 Fig. 5 on top of the cylinder 1 Fig. 5 a curve-plate 10 may be provided, in order to give a smooth rolling to the pres sure-roller 11. Fig. 6 shows a slight alteration, namely hollows 12; 13 for the holding means 8, 9, over which the pressure-roller will roll. roller have a perfect smooth run, the hollows of Fig. 6 may be covered with small lids or the construction may be carried out as per Figs. 7 7 a. p I

The filling-up of the drum 1 with ink, in order to avoid any loss or soiling the hands, is arranged in such a manner, that the inkpackage, for instance a tube 16 Fig. 8 fits properly into the filling-hole 2. The filling through the side-plate However, should the pressure- 3 of the drum 1 by ice likelihood, that the mechanism could be dammeans of a-tube Fig. 8 is preferable. The

:tap closing the filling-hole 2 is provided with ring with funnel 17 Fig. 8 has to be fixed in.-

side around the, filling-hole, if possible near to the axle of the. drum, in order to avoid ink dripping into the filling-hole and outside.

A removable crank pin in shape of a slitted segment 18 Figs. 2, 3 ora slitted crank 18a Figs. 12 and 12aor such like is fixed on the drum 'l, which moves by means of an actuating arm 19 the swing-levers 20 putting in ac-' tion the paper-feeder. By altering the crankpin 12 the writing on the stencil onthe' drum ecomes another position towards the feeder and the printing begins, earlier or later, which means, the higher or lower. 1

The actuating arm 19 acts on a pair of slitted swing-levers 20, Fig. 3a, which are fixed and working together; by altering the position of the actuating arm 19 at the swing lever at point 21 Fig. 3 the length of the movement of the feeder becomes longer by moving upwards and narrower by moving downwards. By altering: the length of the actuating arm 19 at point 44 the feeder starts also earlier or later. The pair of swing-levers 20 moves an axle 23 Figs. 1, 2,3 3a running onballbearin s 24 on horizontal rails 22; in order to obtain a smooth run, it is advisable to provide spiral springs, which pull the ball bearings a ainst the rails 22.- On this axle 23 is attac ed the paper-feeder 25.

The known feeders for instance with ratchet and spring-finger are easily broken, because the spring-finger works permanently against the ratchet. However, the feeders with horizontal slot and special brake have notonly a' long lost motion, but are also subject to breakage. The stoppage of the present feeder is without any mechanical arrangements or cog-wheel or such like, but acts in that manner, that the axle of the feeder-roll 27, usually made of rnbber; is moving freely in a slit, inclined to the paper, 26 Figs. 2, 9, 10; as soon as the feeder is out of action or moved forward, the roll 27 is leaning fast by the weight of the heavy feeder against the back 28a Figs. 9, 10, 10a, which is rough or provided with a file; however, drawing back the feeder 25, the roll becomes free from the back and rolls in the slit without touching the back.

As soon as the last sheet of paper is consumed, the rubber-feeder-roll 27 would be pressed against the table 2861 and there is a aged: In order to avoid this, there is provided one (or two) legs 29 Figs. 9, 9a, 10, 11 on the axle 26 of the roll 27; this small leg 29 is shifting forwards and backwards on the print appears on the paper.

paper, but as soon as the last sheet of paper is consumed, the leg drops, the feeder being in the endsition, into the hollows 30Figs. 9, 11 and raises automaticallythe feeder from the table 28 Fig. 11. 1

In order to have a central feeding, even,

.-. if the paper is not placed quite in the middle of the table 28a, the feeder can be moved side- Wards on the axle 23, in such a manner, that the "feeder is always. in the middle of the paperl Further there are a few more facilities:

The drum 1 is in slitted bearings-40 Figs. 1, 2, 3, which can be closed by bolts 41. Removing the bolts 41, the drum 1 can easily be taken out, which is very advantageous for changing the colour of ink etc.

The paper-holders 32 are not fastened by screws, as it is the rule, but with eccentrics 33 Figs. 1, 2, 3 and 13, 13a. By turning the eccentric 33 to the left, the bracket 32 and the bolt with spring-ring 42 becomeQfree from the table 28; the paper-holding-bracket 32 can easily be shifted in the slit 43 Fig. 2, whereas turning the eccentric 33 to the right ,the bracket 32 is pressed against the table 28 and the bracket 32 is instantly fixed.

. The pressure-roller 11 can be regulated by means of a thumb-screw 34 from outside. Fig. 4 shows the drum 1, the pressure-roller 11 in a swing-bracket 35, generally known, which is pulled upwards by means of springspiral 36; the pressure is switched off by means of an eccentric 37 Figs. 1, 2, 4, 4a, also known. U to the present the screws for regulating t e pressure-roller were uneasy to reachbeing generally underneath the machine and had to be operated by means of a key or screw-driver. The regulation is now done by hand from outside. The thumbscrew 34 Figs. 2, 4 is quite outside of the machine.

As soon as the thumb-screw 34 is turned against the bracket 38 projecting from the frame of the machine, the pressure will be stopped and vice versa; in order to keep the fixed position, a thumb nutv 39 is screwed on top.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim: a I

1. A demountable printing .drum for a -stencilingmachine, having a part of its surface perforated like a sieve and forming a closed cylinder for taking a stock of ink inside, eliminating internal ink trough and dis tributing means, said perforated surface. be- 'ing of smaller area than thestencil printingsurface, said perforated area being perforated less at its edges than at its center, said cylinder being so designed that the stock of ink will lie in an imperforated part of the drum when the machine is stopped and ink I being introduced through a hole in a drumside-plate fitting to the ink-package. 1 2. A "demountable printing drum for at stenciling machine, having an adjustable crank or crank-pin, moving by means Of an adjustable actuating arm slitted swing-levers, putting in action an axle; moving a paperfeeder with automatic leg-switch and slitted inclined bearings, causing thus weightstiippage of the rubber-rpll, said adjustable crank, crank-pin, actuating arm altering the beginning of paperfeeding, said leg-switch raising the paper-feeder from thectable as soon as the last sheet of paper is consumed, K said feeder-rubber-roll being with its axle in inclined slitted bearings pressing when moving forward against an adjustable brake.

J OHANN ARTHUR MUELLER. 

